Cisco Cisco Email Security Appliance C650 Guía Del Usuario
Chapter 6 Using Message Filters to Enforce Email Policies
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Cisco IronPort AsyncOS 7.5 for Email Advanced Configuration Guide
OL-25137-01
Note
The
strip-headers
and
insert-header
actions can be used in combination to
rewrite any message headers in the original message. In some case, it is valid to
have multiple instances of the same header (for example,
have multiple instances of the same header (for example,
Received:
) where in
other cases, multiple instances of the same header could confuse a MUA (for
example, multiple Subject: headers.)
example, multiple Subject: headers.)
When working with headers, remember that the current value of the header
includes changes made during processing (such as with filter actions that add,
remove, or modify message headings). See
includes changes made during processing (such as with filter actions that add,
remove, or modify message headings). See
for more information.
Edit Header Text Action
The
edit-header-text
action allows you to rewrite specified header text using
the regular expression substitution function. The filter matches the regular
expression within the header and replaces it with a regular expression you specify.
expression within the header and replaces it with a regular expression you specify.
For example, an email contains the following subject header:
Subject: SCAN Marketing Messages
The following filter removes the “SCAN” text, and leaves the text, “Marketing
Messages”, in the header:
Messages”, in the header:
After the filter processes the message, it returns the following header:
Subject: Marketing Messages
Edit Body Text Action
The
edit-body-text()
message filter is similar to the
Edit-Header-Text()
filter, but it operates across the body of the message instead of one of the headers.
Remove_SCAN: if true
{
edit-header-text (‘Subject’, ‘^SCAN\\s*’,’’);
}